Investigation of Vacuum Insulator Surface Dielectric Strength with Nanosecond Pulses
The maximum vacuum insulator surface dielectric strength determines the acceleration electric field gradient possible in a short pulse accelerator. Previous work has indicated that higher electric field strengths along the insulator-vacuum interface might be obtained as the pulse duration is decreased. In this work, a 250 kV, single ns wide impulse source was applied to small diameter, segmented insulators samples in a vacuum to evaluate the multi-layer surface dielectric strength of the sample construction. Resonances in the low inductance test geometry were used to obtain unipolar, pulsed electric fields in excess of 100 MV/m on the insulator surface. The sample construction, experimental arrangement and experimental results are presented for the initial data in this work. Modeling of the multi-layer structure is discussed and methods of improving insulator surface dielectric strength in a vacuum are proposed.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 15005840
- Report Number(s):
- UCRL-JC-151647; TRN: US0400213
- Resource Relation:
- Journal Volume: 1; Conference: 2003 Pulsed Power Conference, Dallas, TX (US), 06/15/2003--06/18/2003; Other Information: PBD: 3 Jun 2003
- Country of Publication:
- United States
- Language:
- English
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